New Windows Server 2019 won’t promote to DC

Existing DC is 2008r2. FFL was 2003. Joined new server to domain without issue. Raised FFL to 2008r2 on old DC. Added ADDS role to new server. When attempting to promote new server to DC I get the error message that a DC for company.local cannot be found. That doesn’t make sense because I just joined the new server to that DC ten minutes ago. Restarted both servers with no change. I know the existing DC is online and reachable. Any ideas? Edit- Converted from FRS to DFRS. That went smoothly but still getting error messages stating that the FFL must be 2008 or higher...but it is already 2008r2. On a whim I switched the new server from domain joined to WORKGROUP and rejoined the domain. After doing that the ADDS promotion wizard worked fine. Thanks for the assistance and recommendations, folks.